Application of glycyrrhizic acid in improving hatching performance of broiler hens in later egg laying period

Abstract

The invention discloses application of glycyrrhizic acid to improvement of hatching performance of broiler hens in the later egg laying period, and belongs to the technical field of livestock and poultry breeding and feed preparation. Experiments prove that the production performance, the hatching performance, the egg quality and the reproductive hormone level of the broiler hens in the late egg laying period can be improved by feeding the broiler hens in the late egg laying period with 100 mg / kg of glycyrrhizic acid for 5-8 weeks.

Description

Technical Field

[0001] The invention belongs to the technical field of livestock and poultry breeding and feed preparation, and particularly relates to application of glycyrrhizic acid in improving the hatching performance of broiler breeder hens in the late egg-laying period. Background Art

[0002] Commercial broiler breeding is the main body of the modern broiler production system, and the supply of broilers is the key to determining the production of the entire broiler industry chain. In actual production, after the high-frequency egg-laying cycle at the peak, the breeder hens will gradually enter the late egg-laying period. At this stage, the hatching performance of the breeder hens (late egg-laying period) declines rapidly, mainly manifested in the decline in egg production rate, fertilization rate, hatching rate and the quality of offspring chicks, which seriously affects the economic benefits of the enterprise. How to alleviate the decline in the reproductive performance of broiler breeder hens in the late egg-laying period and increase the number of hatching eggs and hatching rate has become a technical problem that the industry at home and abroad urgently needs to break through. The development of new plant extract feed additives is considered to be an important measure to promote the adjustment of feed industrialization, the development of characteristic plant resources and the promotion of healthy poultry farming.

[0003] Glycyrrhizic acid (GA) is an important physiologically active substance in the traditional Chinese medicine liquorice, and exists mainly in the form of sodium, potassium and calcium salts in nature. Glycyrrhizic acid has a wide range of pharmacological effects, including anti-inflammatory, antioxidant and liver protection. The present invention aims to reveal the function and effect of glycyrrhizic acid in improving the reproductive organs of broiler breeder hens in the late egg-laying period. Summary of the invention

[0004] The present invention aims to provide an application of glycyrrhizic acid in improving the hatching performance of broiler breeder hens in the late egg-laying period in order to address the problems existing in the production of broiler breeder hens such as aggravated oxidative damage, weakened reproductive organ function, reduced reproductive hormones, and decreased reproductive performance.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] A feed containing glycyrrhizic acid, wherein 100 mg / kg of glycyrrhizic acid is added to the daily diet.

[0007] A method for improving the hatching performance of broiler breeder hens in the late egg-laying period, comprising feeding 100 mg / kg of glycyrrhizic acid to the broiler breeder hens in the late egg-laying period for 5-8 weeks.

[0008] Application of glycyrrhizic acid in improving the hatching performance of broiler breeder hens in the late egg-laying period, wherein the glycyrrhizic acid has the following characteristics in application:

[0009] 1) Significantly reduce abdominal fat index;

[0010] 2) Improve feed conversion rate and reduce the rate of deformed eggs;

[0011] 3) Improve the hatching rate of breeding eggs and fertilized eggs;

[0012] 4) Improve the egg white height and eggshell strength;

[0013] 5) Increase serum progesterone levels.

[0014] Beneficial effects:

[0015] The invention discloses a feed containing glycyrrhizic acid, a method for improving the hatching performance of broiler breeder hens in the late egg-laying period, and application of glycyrrhizic acid in improving the hatching performance of broiler breeder hens in the late egg-laying period. The invention verifies through experiments that feeding 100 mg / kg of glycyrrhizic acid to broiler breeder hens in the late egg-laying period for 5-8 weeks can improve the production performance, hatching performance, egg quality and reproductive hormone level of the broiler breeder hens in the late egg-laying period. DETAILED DESCRIPTION

[0016] The following is a detailed description of an embodiment of the present invention. This embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation method and a specific operation process are given, but the protection scope of the present invention is not limited to the following embodiment.

[0017] Example

[0018] Experimental treatment

[0019] Table 1 Experimental groups and treatments

[0020]

[0021] Test methods

[0022] The experiment selected 144 50-week-old Lifeng white-feathered broiler breeders with similar body weight and physiological state, and randomly divided them into two dietary treatment groups, with 6 replicates in each treatment and 12 chickens in each replicate. The two treatment groups were divided into a control group and an experimental treatment group. During the period, they were fed and watered according to normal broiler management, with a pre-feeding period of 1 week and an experimental period of 8 weeks. At the end of the 8th week of the experiment, 210 fertilized eggs were randomly collected from each treatment group for incubation. During the experiment, the production performance of breeder chickens, hatching performance indicators of breeder eggs, serum reproductive hormone levels of breeder chickens, and egg quality were measured.

[0023] Test result 1: Organ index

[0024] Table 2 Effects of dietary glycyrrhizic acid on organ indexes of late laying hens

[0025]

[0026] Note: Organ index (g / kg) = organ weight (g) / live body weight (kg). Data in the table are expressed as mean ± standard error (n=6); Indicates that there is a significant difference between the groups (P < 0.05). The same as in the following table.

[0027] As shown in Table 2, compared with the CON group, the addition of 100 mg / kg glycyrrhizin to the diet had no significant effect on the liver, spleen and ovarian indices of late laying hens, but significantly reduced the abdominal fat index (P < 0.05).

[0028] Test result 2: production performance

[0029] Table 3 Effects of dietary glycyrrhizic acid on production performance of broiler breeders in the late egg-laying period

[0030]

[0031] Note: The data in the table are expressed as mean ± standard error (n=6).

[0032] As shown in Table 3, compared with the CON group, the GA group significantly increased the average egg production rate of breeder hens from 5 to 8 weeks of the experimental period (P < 0.05). During the entire experimental period, GA treatment had no significant effect on the average egg weight and egg breakage rate of breeder hens in the late laying period. Compared with the CON group, the addition of 100 mg / kg glycyrrhizic acid to the diet had a trend of improving the feed conversion rate of broiler breeders from 5 to 8 weeks in the late laying period (P = 0.066).

[0033] Test results 3: hatching performance

[0034] Table 4 Effects of dietary glycyrrhizic acid on hatching performance of breeder chickens

[0035]

[0036] Note: The data in the table are expressed as mean ± standard error (n=6).

[0037] As shown in Table 4, compared with the control group, adding GA to the breeder diet can significantly improve the hatchability of breeding eggs and the hatchability of fertilized eggs (P < 0.05), but has no significant effect on the fertilization rate of breeding eggs and the rate of healthy offspring.

[0038] Test result 4: Egg quality

[0039] Table 5 Effect of dietary glycyrrhizic acid on egg quality of broiler breeders in late laying period

[0040]

[0041] Note: The data in the table are expressed as mean ± standard error (n=12).

[0042] As shown in Table 5, compared with the CON group, dietary glycyrrhizic acid significantly increased the egg protein height at the end of the experiment (P < 0.05). In addition, dietary glycyrrhizic acid showed a trend of increasing eggshell strength (P = 0.079).

[0043] Test results 5: Reproductive hormone levels and biochemical indicators

[0044] Table 6 Effects of dietary glycyrrhizin on serum reproductive hormone levels and biochemical indices in late laying hens

[0045]

[0046] Note: The data in the table are expressed as mean ± standard error (n=6).

[0047] As shown in Table 6, compared with the CON group, the addition of 100 mg / kg glycyrrhizic acid to the diet significantly increased the serum progesterone content (P < 0.05), but had no significant effect on the serum estrogen content.

[0048] The above embodiments are merely illustrative of the principles and effects of the invention, as well as some embodiments of its application. A person skilled in the art may make several modifications and improvements without departing from the inventive concept of the invention, and all of these belong to the scope of protection of the invention.

Claims

1. A feed comprising glycyrrhizic acid, characterized in that: 100 mg / kg glycyrrhizic acid was added to the diet.

2. A method for improving the hatching performance of broiler breeder hens in the late egg-laying period, characterized in that: Feed 100 mg / kg of glycyrrhizic acid to broiler breeder hens for 5-8 weeks to improve egg production.

3. Use of a feed containing glycyrrhizic acid according to claim 1 or a method for improving the hatching performance of broiler breeder hens in the late egg-laying period according to claim 2 in improving the hatching performance of broiler breeder hens in the late egg-laying period, characterized in that: The glycyrrhizic acid has the following characteristics: 1) Significantly reduce abdominal fat index; 2) Improve feed conversion rate and reduce the rate of deformed eggs; 3) Improve the hatching rate of breeding eggs and fertilized eggs; 4) Improve the egg white height and eggshell strength; 5) Increase serum progesterone levels.

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